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Old 10-25-2013, 10:19 PM
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Does old gas burn lean?

Working on a hot water power washer i recently bought. Has a Kohler Command Pro 14hp engine on it. The muffler turns redhot, the engine backfires a little, surges up and down and runs better with the choke partially closed. All this tells me its running lean.

Its running, but its on old gas. Not sure how old, but it wont start on it, you have to start it on carb cleaner and then it will burn the gas in the tank. Wondering if its just the old gas making it run lean, or if there is another problem? What do you guys think?

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Old 10-26-2013, 05:32 AM
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From you saying it has to run partially choked, it sounds like the carb is plugged up....not enough gas is getting through. I would clean the carb and of course, replace that old gas
I wonder if common sense will ever make a comeback?
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Old 10-26-2013, 09:44 AM
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Old gas is nothing but trouble, and now the gas we use these days is much different than years ago, it won't last nearly as long. This is why if you have a car or truck you don't use every often it's recommended you leave it with as little gas as you can so you can put fresh gas in it when you want to use it.

"How Long Does it Take for Gas to Go Bad?
That depends on a number of factors. For one, it's hard to know how old the gas you just bought actually is. It may be fresh from the refinery, or it may be a month old already by the time you top off your tank. Some gasoline is mixed with better or more oxidation inhibitors than others.
It's a good rule of thumb to avoid leaving gas in your tank or a storage container for more than a couple of months, if you can avoid it."

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Old 10-26-2013, 03:40 PM
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Gas doesn't take long to go bad. I had some premium that was 3 mos. old. Had all kind Car wouldn't run at all. Tried timing, carb. Finally drained the gas. Put in new gas and bingo.
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Old 10-26-2013, 04:56 PM
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Today I drained the tank and connected the engine to an external tank with fresh fuel in it. Also re-cleaned the carb. It ran a lot better (but not perfect) until the fuel pump crapped out... :-( So now I need a new fuel pump.
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